Relationship of MRI-measured pelvimetric dimensions and surgical positions with anaesthesia parameters in robotic perineal prostatectomy.

Theaim of this study was to determine the effect formedby pelvic diameters preoperatively measured throughmultiparametric magnetic resonance imaging (mp-MRI) and different surgical positions on anesthesiaparameters used during perineal robot-assisted radicalprostatectomy (p-RARP). MATERIALS AND METHODS: Six different pelvimetricdimensions were determined preoperatively.Respiratory and hemodynamic variables of the patientswere measured separately and repeatedly in thesupine position, exaggerated lithotomy position at thebeginning of the 15° Trendelenburg position and the60th minute of insufflation. RESULTS: There was a significant increase in thepartial pressure of oxygen (PaO2) in the exaggeratedlithotomy position compared to the supine position.There was no significant change in the partial pressureof carbon dioxide (PCO2) in the exaggerated lithotomyposition compared to the supine position. In the 60thminute of insufflation, there was a significant increasein the PCO2 compared to the supine and exaggerated lithotomy positions. There was no statistically significantchange in the end-tidal carbon dioxide tension(EtCO2), with surgical position or insufflation time. Asignificant negative correlation was observed betweenthe distance of the ischial spines (ISD) and PCO2 change,and a significant positive correlation was observedbetween the angle of the symphysis pubis-seminalvesicles (ASS) and PCO2 change. A significant positivecorrelation was observed between the ASS value andEtCO2 change between the 60th minute of insufflationand exaggerated lithotomy position. CONCLUSION: In our study, the effect caused by differingpelvimetric diameters, surgical positions, andduration of anesthesia during p-RARP on anesthesiaparameters were shown.